Emerson AC8 user manual 7.7.2Define Operating or Standby Mode

System and Control Options

7.7.2Define Operating or Standby Mode

Each output may be defined as Operating (OP), Standby (ST), or Not Used (NU). This setting takes precedence over any setting in the over- ride menu (see 7.12 - Override Output). The default settings are:

•Outputs 1 and 2 are in Operating (OP) mode

•Outputs 3 and 4 are in Standby (ST) mode

•Outputs 5 through 8 are in Not Used (NU)

To change the mode:

•From the Setup Outputs Menu, shown at right, use the arrows ↑↓ to choose Mode for the selected output and press Enter ↵ .

• To change the output’s mode, use the arrows ↑↓ to choose one of these options:

•OP (Operating)

•ST (Standby)

•NU (Not Used)

•Press Enter ↵ .

7.7.3Enable or Disable an Output Device in Alarm Status

You may choose whether to Enable or Disable an output when the con- nected device is in alarm status. The default setting for all output points is Enabled. If Enabled, the device stays enabled when in alarm status. If Disabled, the device is disabled when it goes into alarm.

•From the Setup Outputs Menu, choose In Alarm, as shown at right, and press Enter ↵ .

• To make a change, use the arrows ↑↓ to choose Enable or Disable to determine what happens when an alarm is detected in the device.

• Press Enter ↵ .

Setup Outputs Menu

SETUP DEVICE_1

NORM OPEN/CLOSE: NO

> MODE: OPERATING
↑↓ =NEXT	↵ =SELECT

IN ALARM: ENABLE

EMERG OP: ENABLE

Set Mode

SET MODE: OP

↑↓ =OP/ST/NU ↵ =EDIT

Setup Outputs Menu

SETUP DEVICE_1

NORM OPEN/CLOSE: NO
MODE: OPERATING
↑↓ =NEXT	↵ =SELECT

>IN ALARM: ENABLE

EMERG OP: ENABLE

Change State in Alarm

IN ALARM: DISABLE

↑↓ =E/D ↵ =EDIT

7.7.4Enable or Disable a Device during Emergency Power Operation Setup Outputs Menu

You may choose whether to Enable or Disable an output when the AC8		SETUP DEVICE_1
is in emergency power operation. The default setting for all output		NORM OPEN/CLOSE: NO
points is Enabled.		MODE: OPERATING
• From the Setup Outputs Menu, choose Emerg Op, as shown at		↑↓ =NEXT		↵ =SELECT
		IN ALARM: ENABLE
right, and press Enter ↵ .	>	EMERG OP: ENABLE
• To make a change, use the arrows ↑↓ to choose Enable or Disable
to specify what occurs in emergency power operation.	Change State in Emerg Op
• Press Enter ↵ .
	EMERG OP: DISABLE
7.7.5 Configure Output for Loss of Power (“Fail-Safe”)
	↑↓	=E/D	↵ =EDIT
Each output has an associated jumper that can help prevent undesired

effects when the controller board loses power. For example, without the

proper fail-safe jumper setting, a loss of power might close a switch that is Normally Open (NO)—per- haps shutting off an environmental unit or a fan or closing a valve.

This fail-safe jumper setting is unrelated to configuring an output as Normally Open (NO) or Nor- mally Closed (NC), as described in 7.7.1 - Define Output as Normally Open or Normally Closed.

To configure a digital output jumper for a loss of power:

•Set the jumper in the “OFF” position (factory default) to make the output Normally Open (NO).

•Set the jumper in the “ON” position to make the output Normally Closed (NC).

For more information, see 3.2.3 - Setting the Digital Output Jumpers.

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